AO told me a story about a handfull of E cat rifles that were stolen a few years back. The bad buggers hotwired a 20T excavator and went in through the side of the house, ripped the E cat safe off it's mounts and dumped into waiting vehicle to be opened at their leisure. I'd find it hard to provide security that would not be compromised by a 20T excavator.... then of course they might use a 40T machine....
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